/Engine/Source/Runtime/Messaging/Public/IMessageBus.h
Subscribe
void Unsubscribe ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IMessageReceiver](API\Runtime\Messaging\IMessageReceiver), ESPMode::ThreadSafe > & Subscriber, const [FTopLevelAssetPath](API\Runtime\CoreUObject\UObject\FTopLevelAssetPath) & MessageType )